size(tvec, dim=2)
min(tvec(2, i), tvec(1, i))
a(1, 2, 3)
f(a, b, d=5/2, c=3+3)
A(i,j,k)
X(i)
X(:)
X(a:)
X(:b)
X(a:b)
X(::c)
X(: :c)
X(a::c)
X(a: :c)
X(:b:c)
X(a:b:c)
X(a:b, : :c, a:, a: :c)
